PICTURES have been released after suspected unruly football fans smashed light bulbs and ripped off seat covers in a crowded commuter train.

Police are appealing for information after the rowdy group – who were heard chanting - damaged a train carriage which they boarded at London Bridge on September 14.

Officers believe the men were fans travelling to watch Crystal Palace play Charlton at The Valley that evening when they caused havoc in the commuter carriage.

They also pulled down light gratings and banged on windows in an “intimidating” display in front of other passengers.

Investigating officer Detective Constable Jason Schweiger said: “They had boarded a crowded commuter train at London Bridge and began pulling down light gratings, ripping off and throwing seat covers, smashing light bulbs and banging on and attempting to break windows.

"They were also heard to be chanting.

“This was obviously an intimidating experience for other passengers and we have conducted an in-depth investigation into the incident to try to identify the people responsible.

“This has included working through forensic opportunities, viewing CCTV footage and speaking with witnesses. Images have also been circulated to other police forces and on police intelligence systems but unfortunately to no avail.

“From viewing CCTV on board the train we have now isolated images of four men we would like to speak to. This was a packed train and I am certain that there are people out there with information that could help our investigation.”

Six men have been arrested in connection with the incident and detectives have now released images of two men they believe may have information.

Anyone who recognises the men pictured or has information about the incident is asked to call British Transport Police on 0800 40 50 40 quoting reference B7/LS of 12/12/12. Anyone wishing to remain anonymous can contact Crimestoppers on 0800 555 111.